OX1R, a moderately selective excitatory receptor, binds orexin-A and orexin-B neuropeptides. Upon orexin-A binding, OX1R activates cellular events, elevating cytoplasmic Ca(2+) levels. This interaction positions OX1R as a mediator in orexin neuropeptide signaling, influencing intracellular calcium dynamics in response to orexin-A. OX1R Protein, Human (HEK293, Flag) is the recombinant human-derived OX1R protein, expressed by HEK293 , with N-Flag labeled tag.